/*
 * Copyright (c) 2004-2022, University of Oslo
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * Neither the name of the HISP project nor the names of its contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.hisp.dhis.webapi.mvc.interceptor;

import static org.hisp.dhis.user.UserSettingKey.DB_LOCALE;

import java.util.Locale;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import lombok.AllArgsConstructor;
import org.hisp.dhis.dxf2.common.TranslateParams;
import org.hisp.dhis.user.CurrentUserUtil;
import org.hisp.dhis.user.UserSettingService;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

/**
 * This interceptor is ONLY responsible for setting the current user and its related settings into
 * the current request cycle/thread. The intention is to leave it as simple as possible. Any
 * business rules, if needed, should be evaluated outside (in another interceptor or filter).
 *
 * @author maikel arabori
 */
@AllArgsConstructor
public class UserContextInterceptor extends HandlerInterceptorAdapter implements InitializingBean {
  private static UserContextInterceptor instance;

  private static final String PARAM_TRANSLATE = "translate";

  private static final String PARAM_LOCALE = "locale";

  private final UserSettingService userSettingService;

  public static UserContextInterceptor get() {
    return instance;
  }

  @Override
  public void afterPropertiesSet() {
    instance = this;
  }

  @Override
  public boolean preHandle(
      final HttpServletRequest request, final HttpServletResponse response, final Object handler) {
    String parameter = request.getParameter(PARAM_TRANSLATE);
    boolean translate = !"false".equals(parameter);

    String locale = request.getParameter(PARAM_LOCALE);

    if (CurrentUserUtil.hasCurrentUser()) {
      String username = CurrentUserUtil.getCurrentUsername();
      if (username != null) {
        final Locale dbLocale =
            getLocaleWithDefault(new TranslateParams(translate, locale), username);
        CurrentUserUtil.setUserSetting(DB_LOCALE, dbLocale);
      }
    }

    return true;
  }

  private Locale getLocaleWithDefault(
      final TranslateParams translateParams, final String username) {
    return translateParams.isTranslate()
        ? translateParams.getLocaleWithDefault(
            (Locale) userSettingService.getUserSetting(DB_LOCALE, username))
        : null;
  }
}
